Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6618#issuecomment-108611940
See https://issues.apache.org/jira/browse/SPARK-8062 for the original
stacktrace and investigation.
This PR is opened against branch-1.2 because I'm trying to deliver a hotfix
to a user running 1.2.1; I'm going to open another patch to fix this in 1.3.x,
1.4.x, and master.
While investigating this, I may have discovered other bugs in our input
output metrics code, which I'll follow up on in subsequent patches; see
https://issues.apache.org/jira/browse/SPARK-8086 for details.
/cc @sryza
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